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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b53fab503cc9b4d159f733ea89e482250a41c9daf8fe238edfb7e08fd0beb9' 
  AND token = '+yYbTOxPvjYZbyMMxswi+7OOHbh8p2SlUj+0JDKh39M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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