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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4dd2740de6a030ce7d7a109485ff1c90c96a1e94ff002a754c00e7314446a7' 
  AND token = 'gNmSyFG6p0QrbRmzmg1iV66Ouvx8fMY+usin4QqEYWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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