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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc8fea74c769c155cbf782cba2cb26bc4bd39d9d8ad2f592a0b24e0bdba4b56c' 
  AND token = 'Qz8izAW1FVyZfvlbucI9fK+UI7z8N7fCicZbCOhJrzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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