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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e0f2140ac09499a19e7b43c8c2b236b30900ed692a57977d9a1cae28c445dbf' 
  AND token = 'FOLskEt0H8sbqja9PS8mR77RYnRst9kA0mRlDas1ytg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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