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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '395eba8853c164c97c4605cb59ed17eeebbfddb07c5f08e93da3c7a49befc718' 
  AND token = 'smoTuwpsQLv1lxLq9Seccks6A+dZpurd3QQE0QGFf/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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