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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c60e5ca65757edce33c83521d23122c18dded239a508f097f5cd453a5b40e9c' 
  AND token = 'AC9GdRlI7ZwWERND6odMJbxLV610tWRgetiRiEAAohk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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