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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694235895836773e73fece3696df8b206ca692b9b3656d1e3dc223413091f71c' 
  AND token = 'vcM0FNHdMb4KmD/Xqh7mG2mi7eiRfmqr+fDLof+NmoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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