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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26d935a5fa7bddc9583c08734ce8a9bf187e82749db4bdc82ced7727f4189e1e' 
  AND token = 'Hd31f1AJ8nJT7Nk7jeV4LhEBwmMVGMUZYVQKOSleiKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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