SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c6c071472e39983ff33fbafa7560e88503d2f8cbcfb5ecc2111d342d0670af7' 
  AND token = 'IUY/CSs65ngGJloYljKU/Fr0nJJpNF7XJJrIqapglAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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