SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce19ff8466113ed96d7e2c33bc8a11fca74fd5b485a82f8d8c73525a3453968c' 
  AND token = 'l2P5/qlhwzbYlvaAZnKz07kvExfV7pLJWt2nihgofRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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