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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '185a5c5183b64a03654ee0c205737dd558f06809eb0a6a684b20d2562181822f' 
  AND token = 'hSJ2/DVYhmkq5uKOKf0hLTt0mG7Hbvh53vO2GJCVpac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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