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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b016a720ab18ce1081ab92df110c86f62ff6dc17fccabfe586e170d8e664145' 
  AND token = 'nQ3kWIVR2EwSOo6o46K2LkgmJpbC9YxkduZ4Q48l668=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00109

JSON explain

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