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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067b4029cf2316046b95dba0b44886c725103c87e63ae5d79ed4b2092330c4c6' 
  AND token = 'BtRplzqCgBRoOIBSjGW+Sqya6J3SVbJr2W/K97eOBHI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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