SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a41ee55554e320b06c49a4e55f5119f905396d9f073ffac10cfde3a371a0057' 
  AND token = 'wHPAs/Y9/A/B6Z7tdrIJ++fzUUZ3lXpDXqLLjhIwOTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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