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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f4bd9cf8ad5c232e97be2f305cc5e87fe9a07cb63df265972b1cbd9a1de4ce' 
  AND token = 'd9v7yp3POZ9w6zmwZKxB87AtbG6gwvWoVHg6MpiIhDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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