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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caed7a09f685de76d38c6bba0a7c148f7cecdbe1e6b83c7ff90d5c57375ef33a' 
  AND token = '1PlSwjGIwmIIWEfoCrlIxLln638syXoPruBDd9lipKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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