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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a5fc5c0f8b4876709484acb6015fce5f0b1fd7d07ffc5d9b63dfeed420af04' 
  AND token = 'hl5ODlhQ50tU34G5ZIlQtjp1ea/e8/2gcGqzSmt/KTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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