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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13e2338e8c168483ee2b5746ecaeeba8b97ffcecd65cc929360631a85cb3523' 
  AND token = '0iEJXZD6dHoNpkFLiqsg9XxvSkJlJClYjhtwOXifpbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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