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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe2fb8b17ce333026b7d2d4628ad494030570076c3836e83ba35dd06966d82c2' 
  AND token = 'Bza37CZwHV3IQ+yThSrEvrWZxrGxVQNyPCajW99DSAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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