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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c36aa2c3e8320fa5a3db424d4ee756e049483e38975ebd713e21f7a636d262' 
  AND token = 'IgmHmbfHG2JjDol4rce63QHKlNTvZxyJwRQbViQ9xTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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