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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d11b42979a63e0bda622040e1722a013900f0376e36d677b720fd72096e9914' 
  AND token = 'wll+CKnRhz71/+YTh3fFNzo2w0reAnsuCV6XBUFDW1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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