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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7facffeeb9735e872f4c9b27967e0f6edc9eeb50301a91821bbe40a300f00857' 
  AND token = 'uQJDYtQA0uUB+Bsgbg6Aiujo7TTbm1C/HTPA2m4Ttt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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