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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d42ba96d1c92cc5bf1aff0064acf7a89b682e68ac917ed37b07a99204ffdac8' 
  AND token = 'mCHRUX0kmVIobakmwEMPVAjh/KRX6VeCU3GLJkGx80k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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