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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444bdc4ca918e718fca9b0189d8e9cef8df4da2495e17ef0b85c8ec7664853ef' 
  AND token = '03s3Gt7wLHwzBUslKlEuaeqllkD+o+S//HjE8VMnB5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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