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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d0fe7805f41a39de29ce52afd577ba9ba75815cc82dae7c4fc1d9504c7ba2c' 
  AND token = '1X5J0Zh94BdTGmII0zeEpBIHVRoMBd+f6hDh2Cm0/S4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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