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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '080f7aa102ec60e77f459b4afdddda9f8cc7eae0622a3b23e64c9215de40493d' 
  AND token = '10uL8FN3Yy/w0QZJZ+fjAoc6J7QJfI/0Yka67/pL8nU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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