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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5313cf870ec66c3a680fdd10c6a49ccd6477d56b969bc6567eb4080c2c97722' 
  AND token = 'ScBSXGRTyRMZU0bd9Q3SOO4oqqbPwZtgMOYGz0gUS9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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