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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '933d39457b5efafd0deea537f4d2f9dfbbea46397baf957cf4d60699e4f56438' 
  AND token = 'uSKSM3BDL7kIkToEqWtg0iqolz+uVvmeqjqInf0Mg3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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