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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a786e7a6cdb3f22897a8a14e0d3de8a17877da1db551d679d7f0762b7f0a7cc3' 
  AND token = 'EMXwXs0Iidt1Xd9wewn7pKt9nQonOtDNB7kUSlFcTYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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