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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fc95b174ae0c01e94c61addb2121a0a79b99ca10c749f356a75ad8a63e97b3a' 
  AND token = 'u5LuH9TEDsu278JvA/YXDSDCQlV4vDjlFnuSzTtq33U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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