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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da2e2ef43ada70f23e97e70a46f9d0e39a3a447f3f9cb7c79b5cb9264be1fd6a' 
  AND token = 'iXC48EZAktRbb/For2bUG13AQsz/84IRH+W40zb4pmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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