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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5799a5305e24dd2268c4e4a5f9825ec3f8c39c5e0ccbaf0ab6c564740bbb7d' 
  AND token = 'q6dBc9Deri7b3f+mZbOB2wYXL3CFFv0YLVBo+W2yqrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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