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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb0c5e46edc73fd5e87c46cba2337b192bdffe47a033807ef2343c7bfb610ce1' 
  AND token = 'h2NAgFsQcF+lfQaH7g1ZDFiOcyJUdqlkuup7Bqy5QjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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