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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ef97c7221f986f9c0c025969c8c96641faed6db987fe426ac692115154fa54' 
  AND token = 'DSQrg5CuXzSgurIbtFInO8g76/cpFqJp6TwsAw/ctXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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