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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569da21c44b8a27ce6d89a96aa11777aa6af57bf544572fcfa80ef0f823f0fe9' 
  AND token = 'LXZfnqdrefltqMQxrIE6KamWy0QrfQoXuQy2b+ktzno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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