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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f99498d1180372cbcb0ee86796577c3ade7660c9b796e02fc6e5e6b1286f9dd' 
  AND token = 'b2aA2DO/29z6L6fVbsSurQA3WSnuoUtXXB13jbjsKuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

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