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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12051d36b4b29fa4e7489dc3cbf25936eef3684cfeb782191d878987601eefc' 
  AND token = '5iP+F8gJ1wmP3vWCRwCxa9+i5QAW8aa1ndHmuALhrwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}