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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4d5aa54f4e969e93a2605beca1fdf1243fcb3ba50cfd67ec964d0eef5ab104' 
  AND token = 'dDJM4/xyfMXM45/y/cxlR8vnoo9ugL/rYM6lj+WGmvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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