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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef71a52e1ebc4a2f6014696ef9acef35fec0268d91ab5d0bf90c903d94fb3c83' 
  AND token = 'pC/6lekNqLbkU9Ifz2V8ZFci+W9kaVZQedx7BnMn6XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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