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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd09d2d66be5687e42db5fb83188c2d060550a7c3cd55b88d22374c3068d35ced' 
  AND token = '0hlddLqV8vv0WeWTzfiC32TFi7YpmeUUAW1/6dZxWaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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