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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b08fd03a73972741cf699021e7029ae7b8ca6fc342cde26add2e2eb10558c484' 
  AND token = 'V+4elOH0+EnL5NFuUUyNMVwYJzKMfuAAgepvdAgmfP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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