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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b6c89839d5674e5bf3d060ae6e45fa69acd9432fa96d0379bae8fe8531f6881' 
  AND token = 'Ljqs7dUEr5I4tdlUasqhQa0Q59zXuzcuPZD8nuQDlL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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