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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22a5971e2bb5694909571bdcb9007cf295939bf2a4f78fdfa38b6df50276f91e' 
  AND token = '7hJDDE6TlYVUaajmXrr5nJGQ4JiDHwsZSK0pTkGOZOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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