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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1ea9d522fcc42d0468946d9d6f182abf95fefce884f4be9958f5d29d1d21ba' 
  AND token = '+aZxZvZO7OHQQV1IdeWr7dak/XF76cOkfSVaEN9SF/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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