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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f4683a4233e67da70165bb27e9ed9a9ce82e619646b3e2efd5d578f032d81da' 
  AND token = 'oSGzAokhpG2IhEVIs5lnzDqOzIxs4AX1/fctAK+DpII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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