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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f833b6af26e1383e8f1ff8767067d4728bd69bee8071ce1465fabc1387b8763' 
  AND token = 'YVHwFsqmqS9RyuCzlarxNe30oxYRuBBdFXq7BVLGxiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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