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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669f273d6cb0c66e75ed2f40393792bd8b633d42a19ae5d0c0328d98ac4ac718' 
  AND token = 'APptS15P8VkYx6qv6fGEjf/jF+qr9BaPam6x/I74D8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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