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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac73ded51c0f35128ac39c8352a2fd18ea6dc10793024cfe08cdfa667aa720c8' 
  AND token = 'qrSOwN2ZE9p0h4sNnlcfUIXz4WtFff8Vmbxwft7h9Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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