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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f1b4c595a56f644564a80b4f60d4a9987be3a4ad144d5c913234897175ad56' 
  AND token = '3NxoticyX7pXLRTGECt0AIeIpN2BOe/fYCkQtXZluYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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