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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf1948f3cded0553a506ccebf726cdec6959d80b6739e8ba2f9636abe74e32b' 
  AND token = '00wvfBROdwamUvcfq7NRGKoahsuPLC/BWe6g6F0NShw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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