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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daed53483b76e753fd02744414cec9bfece8eb11af195e888a744a8f6f99a72a' 
  AND token = '8lqd88dnYToQyyxhlduEQZWvGxNdAZR3MEo6r/NUIiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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