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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4041e4730548cfbb6f051e5fa044e3ac9c9c2cb10248cbab7fccc987d222fbb4' 
  AND token = 'q+52teP2pU6X3cqg8qIiyKo/iIeFJUuFUhjqv1TN6+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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