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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed2879204d9d65d9d9c3c265d2b92ab1e53ae2dc586d23db3fe9e703b8c2de5c' 
  AND token = '94XLQ+7szJFF0470+ZW0CVANYs8rTZEw0i9C9Y4XLuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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