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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8e65ff20d959ddeba6eb5aa054d52f266ac474113408403108a44e56e1bc60' 
  AND token = 'ua///UScaXaF6+E7bn8TouVeYa2yWOpR0faFafjjOBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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